因特网从１９９４年投入商业化应用以来，短短五、六年时间，取得了极其迅猛的发展。到 １９９９年底，全球的上网人数已达到２．６亿人；我国的上网人数也已达到８９０万人。随着上网人数的几何级数增长，网络也随之成为商家开展广告活动的重要载体。据统计，全球网络广告收入 Since it was put into commercial use in 1994, the Internet has achieved extremely rapid development in just five or six years. By the end of 1999, the number of people accessing the Internet in the world had reached 260 million; the number of people accessing the Internet in our country reached 8,900,000. With the geometric progression of the number of people on the Internet, the Internet has also become an important vehicle for businesses to carry out advertising activities. According to statistics, the global online advertising revenue